On 06/09/17 05:44, Shawn Lin wrote:> + Seraphime> > On 2017/9/6 3:47, Pavel Machek wrote:>> Hi!>>>> I tried to write to the MMC card; process hung and I got this in the>> dmesg.> > > A similar report for 4.13 cycle was here:> > https://lkml.org/lkml/2017/8/10/824> > Seems 4.13-rc4 was already broken for that but unfortuantely I didn't> reproduce that. So maybe Seraphime can do git-bisect as he said "I get> it everytime" for which I assume it could be easy for him to find out> the problematic commit?>

One obvious weakness in the new mmc_init_request() is the possibilitythat it might be called before card->bouncesz is set up. That couldresult in bouncing being done but mq_rq->bounce_sg is null.This might help: